UPS: Uninterrupted Power System
What is a UPS?
UPS is a device that: 1. Provides backup power when utility power fails, either long enough for critical equipment to shut down gracefully so that no data is lost, or long enough to keep required loads operational until a generator comes online. 2. Conditions incoming power so that all-too-common sags and surges don’t damage sensitive electronic gear.
What are the main types of UPS?
UPSs come in three major varieties, which are also known as topologies:
In normal operation, these feed incoming utility AC power to IT equipment. If the AC input supply falls out of predefined limits, the UPS utilizes its inverter to draw current from the battery, and also disconnects the AC input supply to prevent backfeed from the inverter to the utility. The UPS stays on battery power until the AC input returns to normal tolerances or the battery runs out of power, whichever happens first. Two of the most popular single-conversion designs are standby and line-interactive: